It is looking like time to swap out the tires due to age on my 2015 Speedmaster even though there is only 10,117 KM on them. When I bought the bike in 2019 there was only 1634km on the bike I put on the rest over the past two seasons. All reports I've read say they are at their limit although still lots of tread depth left so looking to hear what everyone's favourite is these days. I will more then likely stick with stock sizes.
Well, provided the tires are not dry rotted, I suggest just run them & continue to inspect them periodically. If/when you decide to replace, you can't go wrong with Michelin Commander II/III.